This is the first CRAN release of xnicher (formerly developed as nicher)
for fitting ecological niche models with ellipsoidal environmental responses
under the M hypothesis.
optimize_niche() supports nine likelihood families:
presence_only, weighted, ip_weighted, skew_normal,
skew_normal_weighted, skew_t, skew_t_weighted, ncst,
and ncst_weighted.weighted, ip_weighted, and their skew variants)
use M-background environmental data through env_m.skew_normal, skew_t, ncst, and their
weighted variants) model asymmetric or heavy-tailed environmental responses.logLik(), AIC(), BIC(), and nobs().compare_xnicher() for side-by-side model comparison.cv_xnicher() for k-fold and leave-one-out cross-validation of fitted
xnicher objects.Rhipicephalus microplus
example with iso-suitability and geographic maps.